You should also take in consideration the amount of fan content contributed every day to the communinty
If we didn't have that we'd pretty much all lose interest. Honestly the fandom makes me like the show to the point I'm actually keeping track of episodes in a series for once (its the first time i've made the effort to catch every new episode for a TV show)
If we didn't have the fandom I would probably move on.
Eventually, people will whither away faster than the people discovering the fandom and the show. When the community dies...
aww hell who am I kidding I'll still be a brony anyway